Coherence scale of the Kondo lattice

Citation
S. Burdin et al., Coherence scale of the Kondo lattice, PHYS REV L, 85(5), 2000, pp. 1048-1051
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
85
Issue
5
Year of publication
2000
Pages
1048 - 1051
Database
ISI
SICI code
0031-9007(20000731)85:5<1048:CSOTKL>2.0.ZU;2-J
Abstract
It is shown that the large-N approach yields two energy scales for the Kond o lattice model. The single-impurity Kondo temperature, T-K, signals the on set of local singlet formation, while Fermi-liquid coherence sets in only b elow a lower scale, T*. At low conduction electron density n(c) ("exhaustio n" limit), the ratio T*/T-K is much smaller than unity, and is shown to dep end only on n(c) and not on the Kondo coupling. The physical meaning of the se two scales is demonstrated by computing several quantities as a function of n(c) and temperature.